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please clarify AHI

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adreamweaver +0 points · about 2 months ago Original Poster

Would someone please explain what the difference is between an AHI 1A and an AHI 1B? Everything I read online seams to be made for a medical professional. I would like to know what this means in layman terms.

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Sierra +0 points · about 2 months ago Sleep Patron

I have never heard of 1A and 1B. Where have you seen it? AHI is simply Apnea Hypopnea Index. It is the total number of obstructive apnea, central apnea, and hypopnea events divided by the number of hours slept. It is basically events per hour.

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adreamweaver +0 points · about 2 months ago Original Poster

When I got my results they were listed as an AHI 1A and an AHI 1B, both with different values, one indicating moderate OSA and the other indicating mild OSA and barely qualifying me for coverage by my insurance, according to what I was told.

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Sierra +0 points · about 2 months ago Sleep Patron

On a google search I found some reference in how hypopneas are defined. They are the "H" part of the Apnea Hypopnea Index. It appears there may be A1 hypopneas with 3% oxygen desaturation, as well as B1 hypopneas which have 4% desaturation. I would expect the A1 definition to give a higher number than the B1.

In the UK the National Health Service will not treat mild (5-15 AHI) while they do treat moderate (15-30). In North America mild apnea is more likely to be treated/insured.

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